Brand New Genuine COLSIBRO® Valve guides for engine types
Not to be confused with cheaper bronze guides which are a lighter colour, these are a silicon copper alloy
As supplied by ourselves to many top engine builders.
Colsibro® is a precipitation hardening copper nickel silicon that offers a remarkable blend of physical and mechanical attributes unrivalled by many other grades of copper alloy. It is widely specified for use in high performance automotive and motorsport engine components including valve guides & valve seats.
Almost half the friction compared with OE cast iron ones and twice the thermal conductivity
Simply the best valve guide material for high performance engines